Condition responsive fluid flow monitoring and control system

Claim 1

IN A CONTROL SYSTEM FOR AN ELECTRIC MOTOR DRIVEN PUMP OF THE RECIPROCATING TYPE WHEREIN ELECTRORESPONSIVE MEANS ARE ARRANGED TO CONTROL OPERATION OF THE PUMP DRIVING MOTOR, THE IMPROVEMENT COMPRISING TIMING MEANS PRESETTABLE TO CONTROL UPON INITIATION OF OPERATION THEREOF SAID ELECTRORESPONSIVE MEANS TO INITIATE OPERATION OF THE PUMP DRIVING MOTOR, THE RECIPROCATING PUMP WHEN SO DRIVEN CAUSING PULSATING FLUID FLOW, AND PUMP-OFF CONTROL MEANS OPERABLE TO CONTROL THE ELECTRORESPONSIVE MEAN TO CONTROL OPERATION OF THE PUMP DRIVING MOTOR UNDER THE CONTROL OF SAID PULSATING FLUID FLOW, SAID PUMP-OFF CONTROL MEANS COMPRISING FLUID PULSE DETECTING MEANS SUBJECTED TO SAID FLUID PULSATIONS TO AFFORD A PULSING INPUT CONTROL SIGNAL PROPORTIONAL TO THE FLUID PULSES, AND ALTERNATING CURRENT RESPONSIVE MEANS OPERABLE IN RESPONSE TO SAID INPUT CONTROL SIGNAL PULSES WHEN THEY ARE ABOVE A PREDETERMINED VALUE INDICATIVE OF SUBSTANTIAL FLUID FLOW FOR TRANSFERRING CONTROL OF SAID ELECTRORESPONSIVE MEANS TO SAID PUMP-OFF CONTROL MEANS FOLLOWING THE INITIATING FUNCTION OF SAID TIMING MEANS, SAID PUMP-OFF CONTROL MEANS THEREAFTER MAINTAINING CONTROL OF SAID ELECTRORESPONSIVE MEANS TO CONTINUE OPERATION OF THE PUMP DRIVING MOTOR, AND SAID ALTERNATING CURRENT RESPONSIVE MEANS COMPRISING MEANS RESPONSIVE TO DECREASE OF SAID INPUT CONTROL SIGNAL PULSES BELOW SAID PREDETERMINED VALUE INDICATIVE OF INSUFFICIENT FLUID FLOW FOR OPERATING THE ELECTRORESPONSIVE MEANS TO DISCONTINUE OPERATION OF THE PUMP DRIVING MOTOR AND TO TRANSFER CONTROL OF THE ELECTRORESPONSIVE MEANS BACK TO SAID TIMING MEANS.